Furnace construction



July 1, 1930. 5. L. DANFORTH, JR

FURNACE CONSTRUCTION Original Filed Sept. 26, 1921 arsed July 1,1930

PATENT OFFICE;

GEORGE L. DANFOBTH, JR., OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO OPEN HEABTH COMBUSTION COMPANY, OF CHICAGO, ILLINOI5,- A.

CORPORATION OF DELAWARE FURNACE CONSTRUCTION Original application filed September 26, 1921, Serial No. 503,241. Divided and this application med April 4, 1930. Serial No. $41,544.

This invention relates to anew and improved open hearth furnace, and more particularly to a construction adapted to so direct the entering gases and airin an open hearth furnace as to produce a quick burning and intensely hotfiame adapted to provide working heat adjacent the full surface of the metal in the furnace, and further adapted to provide a large port area through which to 0 exhaust the products of combustion.

This application is a division of my copending application Serial No. 503,241, filed September 26, 1921.

My invention comprises an improvement in that portion of an open hearth furnace between the ports and the bath or melting chamber, and the remainder of the furnace and its appurtenances may be of any usual construction.- -As is well known in open g hearth practice, the furnace is double-ended and reversible, and is provided at each end with gas or air ports which serve upon the outgoing end to carryofi the products of combustion. In certain types of these fura}; naces burning producer or like gases, these incoming gases are passed through regenerative chambers and are thus preheated. The incoming air is preheated in a similar manner and the heat of the furnace flame is correspondingly increased. It is highly desirable in such furnaces to provide a short, quick flame which is directed toward the metal in the bath and which does not extend to the outgoing end of the furnace.

However, in actual practice, since the same ports serve both to introduce .the air and gas and to carry off the products of combustion, the latter function has been largely the determining factor as regards the size of to ports. This is for the reason'that the prodture of the incoming air and gas. "It is i'rn-' practical to secure such a mixture and flame gas ports are of the usualucts of combustion are of considerably; g'reat-' or volume than the incoming air and gas.

To secure a short, uick flame, it is essential that there be a quick and thorough mix whenethe air and comparatively large area. Endeavors are made to secure this quick mixture with such ports bysurrounding the gas stream upon its sides and top with the air stream. However,

end of the furnace. The addition of auxiliary ports and uptakes unduly complicates the structure and this is particularly true in the usual type of furnace burning producer or similar gases. In such furnaces, as generally constructed, a single gas uptake and port is flanked by an air uptake and port upon each side thereof. All these ports are .essential to the operation of a furnace upon the incoming end, although as has been stated, the port area is increased over that necessary for the incoming air and gas in order to be of a size adequate to take care of the products of combustion.

It is an object of the present invention to provide means located intermediate the ports and the furnace chamber which means are adapted to vary the effective passage area between the ports and chamber.

It is a further object to provide means of this character which are adjustable to provide the full port area for handling the prod 'ucts of combustion.

It is an additional object to provide means which may be readily installed without undue modification of the existing furnace structure.

urnace chamber, these dampers ing adjustable to vary the effective passage area.

I have illustrated a preferred embodiment .of my invention in the accompanying drawings, in which L v p 5 Figure flis a fragmentary, longitudinal section of an open hearth furnace having my v p invention applied thereto; and

Figure 2-is'a horizontal section of the form" 1 a of construction shown in-Figure In the form of construction shown in th drawings, the central gas uptake 51 le a ds to v the gas port 52. The lateral air uptakes 53' discharge upon either-side of the gasuptake, n The furnace walls are deflected inwardly a is somewhat at 54 and thus direct the air streams laterally toward the gas stream-4Q This formation of the walhhowever, is not suflicient toobstruct the outgoing gases..- The slidingndamperbois carried in the inclined water-cooled guideways 56 and is handled by cable 57. In its upper position, :the damper is housed in the box 58. A flange 59 upon the damper interfits with a flange 60 upon the box to prevent passage-of gases into 5 the box when the damper is lowered. This dam er when loweredlimits. the passage a'rea and orces the mixture of the air-and gasdue to this restriction in area. Qnthe outgoin end, it is raised and permits the fullarea o the ports tobe effective for carrying off the products of combustion,v I 1 The form of construction which I have shown serves to restrict the efi'ective passage area between theports and the furnace upon 7 theincomin 1 end of the furnace; It thus causes a quic min ling ofair and gas iandi-a short flame upon t, e incoming end and further permits thereadydischarge of the prod- T nets of combustion through t'he-full port area. Modifications of my construetion'maybe made and it is my intention to cover all variations coming within the'spirit and scope of theappended claims. V

, I claim: 1. Inaregenerative furnace having an air port at each end thereof,- and inclined slide valves for controlling theoutletpassage of said ports. y I 2. In a regenerative furnace having an air port at each'end thereof, and slide valves for controlling the outlet passage ofsaid ports, said valves being inclined inwardly and downwardly so as to direct the outflow of air downwardlyinto the furnace. v

Signed at Chicago, Illinois, this 1st day of April, 1938. i v I t GEORGE L. DALNFORTH, Ja 

